Type-writing machine.



W. N. ONDERDONK.

I TYPE wmnm; MAcmNE.

l APPLICATION FILED MAY 3. 1915. l 1,216,838, Patentedv Feb. 20, 1917.

' 2 SHEETS*SHEET I.

WITNEESEE.; I /W. #Q

Patented Feb. 2o, 1917.

2 SHEETS-SHEET 2.

I-IISATTIJRNEY FIG@ UNTTED sTATEs PATENT oEEreE.

WESLEY N. ONDERDONK, OF SYRACUSE, NEW YORK, ASSIGNOR TO REMINGTON TYPE- WRITER COMPANY, 0F ILION, NEW YORK, A CORPORATION 0F NEW YORK.

TYPE-WRITING MAeHINE.

Specification .of Letters Patent.

Application led May 3, 1915. Serial No. 25,464!

10 all whom t may concern:

Be it known that I, WESLEY N. ONDER- noNK, citizen of the United States, and resident of Syracuse, in the county of Onondaga and State of New York, have invented certain new and useful Improvements in Type-lVriting Machines, of which the following is a specification.

My invention relates to typewriting machines and it has for its principal object to provide an improved means for arresting the return stroke of the space bar or space key of the typewriter in such manner as to prevent vibration or rebound of said space bar or space key. In certain forms of the Monarch typewriter the space bar has been disconnected from the universal bar and from the ribbon vibrator mechanism and operates only the dog rocker of the carriage escapement, the load on the space bar being thus reduced. It has been found-thatif the said bar was quickly depressed and released, it rebounded from the stop that limited its upward motion and vibrated to a certain extent and sometimes to a sufficient extent to cause skipping of the escapement. To remedy this trouble was the immediate and specific occasion of the making of this invention.

To the above ends my invention consists in certain features of construction and combinations and arrangements of parts, all of which will be fully set forth herein and par-v` ticularly pointed out in the claims.

In the accompanying drawings,

Figure 1 is a fore-and-aft vertical section of enough of a Monarch typewriter to illustrate the embodiment of my invention in that machine.

Fig. 2 is an isometric View of a stop forming part of my invention.

Fig. 3 is an irregular vertical section through said stop.

Fig. 4 is a fragmentary section-like part of Fig. l but illustrating a modiieation.

Fig. 5 is a fragmentary, diagrammatic view in section like part of Fig. 1 and showing the same form of the invention as Fig. 1 but showing the space bar in its depressed position. l

Fig. 6 is a bottom view of the machine, but with many parts omitted.

Figs. 2 and 3 are on a larger scale than the other figures of the drawings.

The main frame 'vofthe Monarch typewriter comprises a base 1, corner posts 2 and a top plate 3, from which last rise standards 4, supporting stationary carriage rails 5, which, through the intervention of rollers (5, support a carriage 7 having a platen 8 mounted therein. Front strike type bars 10 are pivoted on a segment 11 and carry types adapted to strike against vthe front face of the platen 8, and said type bars are operated by links 12 and sub-levers 13 which latter are pivoted on printing key levers 14 and cooperate at their lower ends with a fulcrum rod 15. The key levers are mounted 'to rock on a fulcrum plate 16, and they all overlie a universal bar 17, which is mounted on arms 18 rigid with a rock shaft 20 mounted in the base of the machine. The universalv bar frame, in addition to the universal bar 17, arms 18 and rock shaft 20, comprises, near the middle thea-eef, an arm 21 which is connected by a link 22 with an operating Patented Feb. 20, 1917.

lever 23 pivoted on the underside of the top action of the ribbon vibrator in a manner which it is not necessary to go into here but which is well known in the art. The arm 21 has a forwardly directed part between which and a stationary bracket 27 there is compressed a restoring spring 28 for the universal bar. Said bracket 27 is omitted in Fig. 6 to avoid confusion in the drawing.

In the Monarch machine asat one time constructed the carriage escapelnentv was controlled by an extension of the arm 21. In the present instance, however, the motion of said arm 21 is not communicated directly to the escapement but said arm has a lever 30 pivoted thereto at one side thereof at 31, and said lever has a slot 32 which is engaged by a pin 33 projecting from the arm 21 in such fashion that said pin normally occupies the lower part of said slot sothat if the universal bar be depressed said pin will cause the lever 30 to be rocked with thev universal bar about the axis of the shaft 20; but the lever 30 `can itself be rocked about the pivot 31 without disturbing the arm 21 or the universal bar. At its rear end the lever 30 has pivoted thereto at 34 the lower end of a link 35 which is reta-ined on its pivot by a flat spring 35a. The upper end of the link 85 is pivoted at 86 to the dog rocker 37which dog rocker is vcontrolled by the usual restoring spring 38. Said dog rocker carries the usual or any suitable feed dogs 40 engaging in any suitable manner with the usual escapement rack or wheel 41, which wheel is mounted on the rear end of a shaft having on its forward end the feed pinion 42 that meshes with the feed rack 43, which feed rack is carried by the carriage 7 in the usual way. It is the spring 38 that normally holds up the rear end of the lever 30 whereby the pin 38 occupies the lower part of the slot 32.

The space bar 44 is mounted on the forward ends of two levers 45 which are fulcrumed on" a certain transverse shaft 46 in the base 1 of the typewriter. In the Monarch machine this shaft 46 is the rock shaft of the segment shift mechanism, most of which mechanism is omitted from the present drawings. Said shaft has thereon, as parts of the shift mechanism, certain arms which, in Fig. 6, are shown broken away. The levers 45 extend a short distance to the rear of the shaft 46 where they are engaged by wire restoring springs 47, secured by screws 48 to a cross bar of the base 1. The two levers 45 near their rear ends are rigidly connected by a cross rod 49 and near the middle thereof said rod has a rearwardly projecting arm 50 which is rigidly connected with the rod by means of a pin 51 passing through the rod and through the hub of the arm. The arm 50 has an adjusting screw 52 threaded upward therethrough and having a lock nut. Said screw at its upper end is adapted to engage the underside of a lip or ear 53 bent off from ythe forward arm of the lever 30. The construction is such that if the space bar 44 be depressed the screw 52 will press upward on the ear 53 and rock the lever 30 about its pivot 31 and thus operate the escapement without operat ingthe universal bar or the ribbon vibrator.

In the Monarch machine there are usually provided two stops 54 to limit the downward motion of the space bar, one of these stops being mounted near each end of said bar.

These stops are shown in Fig. 6, but omitted elsewhere for clearness.

The coperating stop devices whereby the return stroke of the space bar is arrested, comprise a lug 55 cast integral with the front bar 56 of the base 1, said lug having an inclined face 57, preferably machined. The other coperating stop member comprises a felt pad 58 mounted on a sheet metal arm 60 suitably secured to the under side of the space bar 44 and set at an inclination corresponding to that of the surface 57 In the specific embodiment of the invention here shown the arm 60 is a T-shaped piece of sheet metal secured to the under side of the space bar by means of two screwsvl, Fig. 5, passing through holes 62 in said T- shaped arm. The depending branch of the arm 60 springs from the rear of the cross part and is curved downward and forward in the manner shown in the drawings, and extending forward beyond the space bar to position for coperation with the stationary stop 55, the lower part of said arm 60 preferably being bent at such an angle as to bring the piece of felt 58 flat against the surface 57. Said piece of felt may be secured in any suitable way to the arm 60. As here shown said arm is perforated and a cord or wire 63 is passed through the felt and' through the perforations and is-drawn down tight and the two'. ends of the wire or cord are then twisted or tied together as indicated in Fig. 3. The arm 60 is ofsuch material and dimensions as to have a little elasticity, and it is also capable of being adj usted by bending.

It will, of course, be understood that these precise'details of construction can be varied to a considerable extent. For example, in Fig. 4, I have shown a sheet metal stop 64 secured to the bar 56 by means of screws or rivets 65 and bent so that its rear surface occupies an angle similar to that of the surface 57 in the other form of the invention.

The coperating Stop surfaces heretofore employed in this situation have been substantially horizontal andwhen they came into contact on a quick up-stroke of the bar, said bar was likely to rebound. According to my invention the coperating stop surfaces are inclined in such a way that. the pressure between them is not directly up and down but is more nearly radial of the arc in which the Space bar moves than tangential of said arc, so that at each'impact between the parts 55 and 58 there is a cramping or wedging of the space bar mount or frame toward the rod 46.

In Fig. 5 the dotted line 66 is an arc struck about the axis of the rod 46 as a center and 67 is a line tangent to said arc where `said arc meets the stop surface 57 68 is a line drawn in the plane of and as a sort of continuation of said stop surface 57. It will be noted that the line 68 and the stop surface 57 are at an inclination to the tangent 67, which tangent represents the direction of motion of the movable stop at the moment when it comes into contact with the stationary stop. It will be noted that this inclination is at an acute angle. This angle should not be so fine or small as to produce such a wedging action as to cause a noticeable resistance to the next operation of the space bar. On the other'hand, this angle should not be so coarse or wide as to allow of the objectionable rebound which it is the purpose of my invention to prevent or to so far reduce as to render it of no consequence.

- lines 67 and 68,A is approximately 30.

by Letters Patent, isc- Various changes can be made in the details of construction and arrangement with-` out departing from my invention.

What I claim as new and desireto secure `1. The combination with a main frame in clliding a transverse front bar, of' a space bar, a stop ccured to and dependingfrom the under si e of said spacef'bar and having a forward inclination, and a coperating stop on said transverse frame bar having:

its stop; surface facing backward at a downward lnclination whereby on the upstroke of said space bar the movable stop engages the stationarystop at an inclination to the path of said and a degressible space bar; of a stationary stopon t e main frame facing backward at a downward inclination, and a. coperating 30 stop secured to the under side of said space vbar and consisting of a dependent,` resilient 'arm'jextendmg downward at a forward inclination into position to'contact with said stationary stop and having its stopsurface facing forward at anl upward inclination whereby on the return -or upstroke of said space-bar the movable stop engages the stationary Stop vat an :inclination ,to the path of said movable stopso as to arrest said .space bar without rebound. its contact surface extending downward at A Onondaga, and State of New York, this 30th Signed at Syracuse, 1n the county of dayI of April, A. D. 1915.

- WESLEY N. ONDERDONK. Witnesses:

Gr. B. BRAND-y J. F. KERRINS, Jr.v

movable/stop so as to arrest 25 

